From: Tao Ma <tm@tao.ma>
To: linux-kernel@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: [PATCH V2 2/2] Documentation: Add sysfs ABI change for cfq's target latency.
Date: Sat, 31 Mar 2012 23:31:07 +0800 [thread overview]
Message-ID: <1333207867-2957-2-git-send-email-tm@tao.ma> (raw)
In-Reply-To: <1333207867-2957-1-git-send-email-tm@tao.ma>
From: Tao Ma <boyu.mt@taobao.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tao Ma <boyu.mt@taobao.com>
---
Documentation/ABI/testing/sysfs-cfq-target-latency | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-cfq-target-latency
diff --git a/Documentation/ABI/testing/sysfs-cfq-target-latency b/Documentation/ABI/testing/sysfs-cfq-target-latency
new file mode 100644
index 0000000..df0f782
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-cfq-target-latency
@@ -0,0 +1,8 @@
+What: /sys/block/<device>/iosched/target_latency
+Date: March 2012
+contact: Tao Ma <boyu.mt@taobao.com>
+Description:
+ The /sys/block/<device>/iosched/target_latency only exists
+ when the user sets cfq to /sys/block/<device>/scheduler.
+ It contains an estimated latency time for the cfq. cfq will
+ use it to calculate the time slice used for every task.
--
1.7.0.4
next prev parent reply other threads:[~2012-03-31 15:31 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-27 8:16 [PATCH] block: Make cfq_target_latency tunable through sysfs Tao Ma
2012-03-29 0:32 ` Greg KH
2012-03-29 0:36 ` Tao Ma
2012-03-29 10:38 ` Jens Axboe
2012-03-31 15:31 ` [PATCH V2 1/2] " Tao Ma
2012-03-31 15:31 ` Tao Ma [this message]
2012-04-01 21:33 ` Jens Axboe
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